#pragma once
/*
* sha1.h
*
* Description:
* This is the header file for code which implements the Secure
* Hashing Algorithm 1 as defined in FIPS PUB 180-1 published
* April 17, 1995.
*
* Many of the variable names in this code, especially the
* single character names, were used because those were the names
* used in the publication.
*
* Please read the file sha1.c for more information.
*
*/

#ifndef _SHA1_H_
#define _SHA1_H_
#include <stdint.h>
/*
* If you do not have the ISO standard stdint.h header file, then you
* must typdef the following:
* name meaning
* uint32_t unsigned 32 bit integer
* uint8_t unsigned 8 bit integer (i.e., unsigned char)
* int_least16_t integer of >= 16 bits
*
*/
#ifndef _SHA_enum_
#define _SHA_enum_
enum
{
	shaSuccess = 0,
	shaNull,         /* Null pointer parameter */
	shaInputTooLong, /* input data too long */
	shaStateError    /* called Input after Result */
};
#endif
#define SHA1HashSize 20
/*
* This structure will hold context information for the SHA-1
* hashing operation
*/
typedef struct SHA1Context
{
	uint32_t Intermediate_Hash[SHA1HashSize / 4]; /* Message Digest */
	uint32_t Length_Low; /* Message length in bits */
	uint32_t Length_High; /* Message length in bits */
	/* Index into message block array */
	int_least16_t Message_Block_Index;
	uint8_t Message_Block[64]; /* 512-bit message blocks */
	int Computed; /* Is the digest computed? */
	int Corrupted; /* Is the message digest corrupted? */
} SHA1Context;


/*
* Function Prototypes
*/
extern "C"
{
	int SHA1Reset(SHA1Context *);
	int SHA1Input(SHA1Context *, const uint8_t *, unsigned int);
	int SHA1Result(SHA1Context *, uint8_t Message_Digest[SHA1HashSize]);
}
#endif
